- Machine Shop & Tool Repair Service, Dunnville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dunnville
- Major Appliances, Dunnville - Household & Kitchen
- Management Consultants & Services, Dunnville
- Manufacturing, Dunnville
- Manufacturing Products, Dunnville
- Marinas & Marina Services, Dunnville
- Martial Arts & Self Defense Schools, Dunnville
- Masonry Materials & Supplies, Dunnville
- Massage Therapists & Professional, Dunnville
- Massage Therapy, Dunnville
- Meat Market, Wholesale & Products, Dunnville
- Mechanical Contractors, Dunnville - Install, Service & Repair
- Medical Supplies & Equipment, Dunnville
- Mens & Womens Clothing, Dunnville
- Mental Health Specialists, Dunnville - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Dunnville
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- Midwives, Dunnville
- Mini & Self Storage, Dunnville
- Mining, Dunnville
- Miscellaneous Government, Dunnville
- Miscellaneous Industry, Dunnville
- Miscellaneous Manufacturing, Dunnville
- Miscellaneous Professional, Dunnville
- Mobile Home Parks & Communities , Dunnville
- Money Transfer Service, Dunnville
- Motor Vehicle, Dunnville
- Motor Vehicle Rental & Leasing, Dunnville
- Moving Truck Rental , Dunnville
- Muffler Shop & Exhaust Systems, Dunnville
- Music, Dunnville
- Music Lessons, Dunnville
- Music Lessons - Instrumental, Dunnville
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